摘要
以汶川地区典型钢筋混凝土简支梁桥为背景,在充分考虑模型参数不确定性的基础上建立一系列桥梁有限元模型样本。采用汶川地震实测地震动,对建立的有限元模型进行非线性动力时程分析,并记录每组分析中桥梁构件的地震峰值响应。采用主成分分析方法对桥梁构件的地震需求参数进行降维处理,计算桥梁结构综合地震需求响应。通过回归分析建立地震动强度与桥梁结构综合需求之间的概率性关系,并对不同地震动强度指标进行分析和比较。结果表明基于速度的地震动强度指标具有较好的有效性、适用性和完备性,可以进一步用于地震易损性分析和地震风险评估。
Based on a typically simply-supported girder bridge in Wenchuan, a set of finite element model samples of bridges were provided by considering the uncertainty of bridge parameters. Nonlinear dynamic transient analysis was preiormed using the Wenchuan earthquake ground motion record,in which seismic peak responses of bridge components were included. The seismic demands of bridge components were analyzed by principal component meth- od for reduction of dimensions, and the composite seismic demand of bridge system was obtained. By using the re- gression analysis method, a probabilistic relationship between the ground motion intensity and the composite seismic demand was established. On this basis, the dift^rent ground motion intensity measures were suggested and com- pared. The results show that the velocity-based ground motion intensity measures have preferable efficiency, profi- ciency and sufficiency, and could be used for the seismic vulnerability analysis and seismic risk assessment further.
出处
《地震工程与工程振动》
CSCD
北大核心
2012年第6期23-31,共9页
Earthquake Engineering and Engineering Dynamics
基金
地震行业科研专项项目(201008005)
关键词
概率性地震需求分析
地震动强度指标
有效性
适用性
完备性
probabilistic seismic demand analysis
ground motion intensity measures
efficiency
proficiency
suffi-ciency
